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Adding to Perl's @INC Array

"You're most likely to have encountered the Perl @INC array in
the context of a "cannot find module" error. This is the list of
directories Perl searches when looking for a module. To see a list
of what's in @INC, try this one-liner:

"erl -e 'print join "n",@INC'

"Note that it includes ., the current working directory. In some
cases, it also includes /etc/perl, which can be a good location for
user-written modules.

"If you're using CPAN as root, or installing modules as packages
from your distribution, everything will wind up in the Right Place
automatically."